Mold for casting brake-shoes.



No. 697,794. Patented Apr. I5, I902.

A. BRAKE. moLn FUR CASTING BRAKE snmzs.

(Application filed Sept. 10, 1898.)

(No Model.) 2 Sheets-Sheet l.

in Van for Winaszms M11110! Ma 7 42% A'lforrzey UNrrn STATES PATENTOFFICE.

AROHIBALD BRAKE, OF TORONTO, CANADA.

MOLD FOR CASTING BRAKE-SHOES.

SPECIl-ICATION forming part of Letters Patent N 0. 697,794, dated April15, 1902.

Application filed $eptembcr 10, 1898. Serial No. 690,622. (No model.)

To aZZ whom it may concern:

Be it known that I, AROHIBALD BRAKE, a subject of Her Majesty the Queenof Great Britain and Ireland, residing atToronto, Canada, have inventedcertain new and useful Improvements in Molds for Casting Brake- Shoes,of which the following is aspecification, reference being had to theaccompanying drawings.

Myinvention relates toimproved means for casting a plurality ofbrake-shoes in the same box at the same time; and the object of myimprovement is to save time and labor, thus reducing the cost ofmanufacture.

I-Ieretofore in casting a plurality of brake shoes at the same time thefollowing difficulties are experienced: In casting eight brakeshoes, forexample, in one molding-box it is necessary that the box be made ofgreater length than can be conveniently and readily handled. It isnecessary that considerable space be left between the shoe-patterns, sothat there may be between the mold-cavities a considerable thickness ofsand, which is necessary to prevent the molt-en metal from breakingthrough from one mold-cavity to another. Consequently considerable timeis lost in turning this cumbrous box. Another diffi culty which isexperienced is that it is necessary, according to the most improvedmethods now in use, first to turn the drag upside down and fill in withsand around the patterns, then turn the drag back and with care and lossof time fill with sand the cope or part above the patterns, andafterward raise the cope to admit of the patterns being removed andagain replace it.

I attain the object of myinvention by means whereby it is possible tohave the shoes cast close together and entirely dispense with the secondoperation of filling in the cope or part above the patterns with sand.The mechanism by which I obtain these objects is illustrated in theaccompanying drawings, in which- Figure 1 is a perspective view of themolding-box, showing the cavity left in the sand on removal of theblock, showing also the dividing-plates which divide the space left bythe block-patterns into several compartments or molds in which the shoesare cast. I Fig. 2 is a perspective View of the block forming myshoepatterus. Fig. 3 is a view of the under side of my improved platewhich forms the top or one side of the mold and bears on therubbing-surface ,of the shoe. Fig. 4 is the jacket or drag.

A is the jacket or drag.

B is the series of shoe-patterns united in one block.

0 is the plate forming the top of the moldcavity. I

D D are the plates dividing the shoe-mold cavity.

The series of patterns B may consist of a number of shoe-patternssecured together or be composed of a single block with ridges or prints12 b b thereon, which project from the back thereof and form depressionsin the sand. The block 13 is first placed upon the bottom board with theprints projecting upward and the drag turned upside down upon the same.The sand is then filled into the drag over the block B. The drag is thenreversed and the block B removed. Into the prints made in the sand bythe ridges b b b are dropped dividing-plates D D, which may be of metalor other suitable material separating the moldcavity left by the block Bin the mold into a number of compartments, each forming a mold for abrake-shoe. The plate 0 may also be used as a bottom board.

The plate 0, which rests on the jacket A and bears on therubbing-surface of the brakeshoe, is made by me usually of metal and hasthat part of its surface which comes in contact with the portions of therubbing-surface of the shoe intended to remain unchilled of a materialwhich will not chill and which will not be destroyed by the heat of themolten metal. A graphite composition, such as is ordinarily used in themaking of crucibles, is the best material known to me for this purpose,and, as in making crucibles, it is desirable that fire-clay be mixedwith the graphite. In the drawings, Fig. 3, the plate is shown as madeof metal, with the exception of the triangular parts a c c c, which areof graphite composition, as aforesaid.

It will readily be seen that when the sand is filled into the drag orjacket, covering the block B with sand, and the drag reversed it willonly be necessary to remove the block B and place the plate 0 on the topof the drag to have the molding-box complete ready for pouring in themolten metal.

Other compositions may be used to form the plate 0. It is only necessarythat the under side of the plate 0 or so much thereof as is not intendedto chill be formed of a material which will not chill and which willform a permanent plate notwithstanding the intense heat of the moltenmetal in order that it may be used a great number of times.

Having obtained a complete box of convenient length and a permanentplate which is not destroyed in the operation of molding and whichdispenses with the necessity of filling in the sand to form the top ofthe mold-cavities for each operation of casting a series of brake-shoes,a great saving of time and labor is effected.

Having now fully described my invention, what I claim is- 1. A mold,comprising a drag, a sand mold therein provided with a series ofconnected mold-cavities, detachable partitions inserted verticallyedgewise in the sand at the sides of the mold-cavities and partiallyseparating the same into individual mold-cavities, and a plate-copecovering the upper edges of the partitions and mold-cavities, and shapedto conform to the adjacent faces of the articles to be cast;substantially as described.

2. A mold comprising a drag, a sand mold therein provided with a seriesof mold-cavities, and a metallic plate-cope covering said sand mold andhaving a portion of its surface over the several mold-cavities providedwith a permanently-attached non-metallic composite material to preventchilling the adjacent face of the casting; substantially as described.

3. A mold, comprising a drag, a sand mold therein, a detachable metalpartition within the mold and dividing the same into a plurality ofmold-cavities, and a plate-cope shaped to conform to a portion of thecontour of the article to be cast, said cope having its under or moldface composed partly of metal and partly of non-metallic material,substantially as specified.

4. A mold, comprising a drag, a sand mold therein divided into aplurality of mold-cavities, and a plate-cope shaped to conform to aportion of the contour of the article to be cast, said plate having itsunder or mold face composed partly of metal chilling-surfaces and partlyof a composition of fire-clay and graphite, substantially as specified.

5. A mold, comprising the drag, the pattern-block provided with a seriesof individual patterns separated by a series of ridges or ribs andadapted to be set across the drag with its patterns and ribs dependingtherein, and an imperforate plate-cope adapted to serve as a bottomboard to support the sand and, on removal of the pattern, cover the sandand the mold-cavities therein, the said cope being provided over themold-cavities with non-metallic material; substantially as described.

A. BRAKE.

Witnesses:

J. DILLON, EDITH LACKIE.

